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This module is an implementation of PEP 205:
http://www.python.org/dev/peps/pep-0205/
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Entries in the dictionary will be discarded when no strong
reference to the value exists anymore
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c c s6 t | ƒ $ x | j j ƒ D] } | Vq WWd QXd S( s Return an iterator that yields the weak references to the values.
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R, c B s& e Z d Z d Z d „ Z d „ Z RS( s[ Specialized reference that includes a key corresponding to the value.
This is used in the WeakValueDictionary to avoid having to create
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an application without adding attributes to those objects. This
can be especially useful with objects that override attribute
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The references are not guaranteed to be 'live' at the time
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creating references that will cause the garbage collector to
keep the keys around longer than needed.
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